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This crustose lichen has been recorded from Fermanagh and a few trees in the Killarney area of County Kerry including walnut. This species of rough-barked nutrient-rich trees, bearing large, conspicuous black, flattened boat-shaped discs (lirellae) which can attain a length of 3mm or more have a tendency to align their growth with the grain of the bark. The simple spores (6–8µm long) develop in multispored sacs called asci. Look for it on ash, sycamore, beech and old elm bark. Spot tests negative.

Key characteristics

Thallus immersed in the bark; discs large compared to other lirellate lichens, black, boat-like, usually with pointed ends